mirror of https://github.com/ARMmbed/mbed-os.git
73 lines
1.8 KiB
C
73 lines
1.8 KiB
C
/* mbed Microcontroller Library
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* Copyright (c) 2006-2013 ARM Limited
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "mbed_assert.h"
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#include "gpio_api.h"
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#include "pinmap.h"
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static int gpio_enabled = 0;
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static void gpio_enable(void)
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{
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gpio_enabled = 1;
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/* Enable AHB clock to the GPIO domain. */
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LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 6);
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/* Peripheral reset control to GPIO and GPIO INT, a "1" bring it out of reset. */
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LPC_SYSCON->PRESETCTRL &= ~(1 << 10);
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LPC_SYSCON->PRESETCTRL |= (1 << 10);
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}
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uint32_t gpio_set(PinName pin)
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{
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if (!gpio_enabled)
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gpio_enable();
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return (1 << ((int)pin >> PIN_SHIFT));
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}
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void gpio_init(gpio_t *obj, PinName pin)
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{
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obj->pin = pin;
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if (pin == (PinName)NC)
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return;
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obj->mask = gpio_set(pin);
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obj->reg_set = &LPC_GPIO_PORT->SET0;
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obj->reg_clr = &LPC_GPIO_PORT->CLR0;
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obj->reg_in = &LPC_GPIO_PORT->PIN0;
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obj->reg_dir = &LPC_GPIO_PORT->DIR0;
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}
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void gpio_mode(gpio_t *obj, PinMode mode)
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{
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pin_mode(obj->pin, mode);
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}
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void gpio_dir(gpio_t *obj, PinDirection direction)
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{
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MBED_ASSERT(obj->pin != (PinName)NC);
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switch (direction) {
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case PIN_INPUT :
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*obj->reg_dir &= ~obj->mask;
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break;
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case PIN_OUTPUT:
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*obj->reg_dir |= obj->mask;
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break;
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}
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}
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